2.1 Biochemistry

Question 1

What are two things that are studied in biochemistry

Answer 1

1.The chemical reactions of biological molecules
2.Close link between the structure of molecules and their functions.( another feature of biochemistry)

Question 2

Hydrogen,Carbon, Oxygen and Notrogen account for more than ____% of atoms in all living beings

Answer 2

99

Question 3

Why is carbon so important as a building block of life

Answer 3

Because carbon atoms can join together to form long chains or ring structures. They can be thought if as basic skeletons of organic molecules(molecules that contain carbon)

Other atoms with different functions are attached to the carbon skeleton

Question 4

The sum total of all biochemical reactions in the body is known as

Answer 4

Metabolism

Question 5

What is the benefit of having a limited variety of molecules?

Answer 5

It is easier to control metabolism

Question 6

The four most common elements in living organisms are in order of abundance

Answer 6

Hydrogen, carbon oxygen and nitrogen

Question 7

The four most common elements in living organisms are in order of abundance

Answer 7

Hydrogen, carbon oxygen and nitrogen

Question 8

What is believed to happen before life evolved?

Answer 8

There was a period of chemical evolution in which simple carbon based biological molecules evolved from even simpler carbon-based biological molecules